安卓json解析的作用，有必要用吗？ android json解析三种方式哪种效率最高
\u4e3a\u4ec0\u4e48\u5b89\u5353\u5f00\u53d1\u8981\u7528\u5230json? json\u662f\u4e0d\u662f\u5176\u5b9e\u5c31\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff1fJSON(JavaScript Object Notation, JS \u5bf9\u8c61\u6807\u8bb0) \u662f\u4e00\u79cd\u8f7b\u91cf\u7ea7\u7684\u6570\u636e\u4ea4\u6362\u683c\u5f0f\u3002\u5b83\u57fa\u4e8e ECMAScript \u89c4\u8303\u7684\u4e00\u4e2a\u5b50\u96c6\uff0c\u91c7\u7528\u5b8c\u5168\u72ec\u7acb\u4e8e\u7f16\u7a0b\u8bed\u8a00\u7684\u6587\u672c\u683c\u5f0f\u6765\u5b58\u50a8\u548c\u8868\u793a\u6570\u636e\u3002\u7b80\u6d01\u548c\u6e05\u6670\u7684\u5c42\u6b21\u7ed3\u6784\u4f7f\u5f97 JSON \u6210\u4e3a\u7406\u60f3\u7684\u6570\u636e\u4ea4\u6362\u8bed\u8a00\u3002 \u6613\u4e8e\u4eba\u9605\u8bfb\u548c\u7f16\u5199\uff0c\u540c\u65f6\u4e5f\u6613\u4e8e\u673a\u5668\u89e3\u6790\u548c\u751f\u6210\uff0c\u5e76\u6709\u6548\u5730\u63d0\u5347\u7f51\u7edc\u4f20\u8f93\u6548\u7387\u3002
\u73b0\u5728\u6570\u636e\u7684\u4ea4\u6362\u4e3b\u6d41\u662fJSON\u3002 javascript\u7b49\u8bed\u8a00\u80fd\u5f88\u597d\u7684\u517c\u5bb9\u4ed6\u3002
\u7528org.json\u4ee5\u53ca\u8c37\u6b4c\u63d0\u4f9bgson\u6765\u89e3\u6790json\u6570\u636e\u7684\u65b9\u5f0f\u66f4\u597d\u4e00\u4e9b\u3002
\u5b89\u5353\u4e0b\u901a\u5e38\u91c7\u7528\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u89e3\u6790json\u6570\u636e\uff1a
1\u3001org.json\u5305\uff08\u5df2\u7ecf\u96c6\u6210\u5230android.jar\u4e2d\u4e86\uff09
2\u3001google\u63d0\u4f9b\u7684gson\u5e93
3\u3001\u963f\u91cc\u5df4\u5df4\u7684fastjson\u5e93
4\u3001json-lib
\u4ee5Google\u51fa\u54c1\u7684Gson\u4e3a\u4f8b\uff0c\u5177\u4f53\u6b65\u9aa4\u4e3a\uff1a
1\u3001\u9996\u5148\uff0c\u4ece code.google.com/p/google-gson/downloads/list\u4e0b\u8f7dGsonAPI\uff1a
google-gson-1.7.1-release.zip \u628agson-1.7.jar copy\u5230libs(\u9879\u76ee\u6839\u76ee\u5f55\u65b0\u5efa\u4e00\u4e2alibs\u6587\u4ef6\u5939)\u4e2d\u3002 \u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4e24\u79cd\u65b9\u6cd5\u89e3\u6790JSON\u6570\u636e\uff0c\u901a\u8fc7\u83b7\u53d6JsonReader\u5bf9\u8c61\u89e3\u6790JSON\u6570\u636e\u3002
\u4ee3\u7801\u5982\u4e0b:
String jsonData = "[{\"username\":\"arthinking\",\"userId\":001},{\"username\":\"Jason\",\"userId\":002}]";
try{
JsonReader reader = new JsonReader(new StringReader(jsonData));
reader.beginArray();
while(reader.hasNext()){
reader.beginObject();
while(reader.hasNext()){
String tagName = reader.nextName();
if(tagName.equals("username")){
System.out.println(reader.nextString());
}
else if(tagName.equals("userId")){
System.out.println(reader.nextString());
}
}
reader.endObject();
}
reader.endArray();
}
catch(Exception e){
e.printStackTrace();
}
2\u3001\u4f7f\u7528Gson\u5bf9\u8c61\u83b7\u53d6User\u5bf9\u8c61\u6570\u636e\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\uff1a
\u4ee3\u7801\u5982\u4e0b\uff1a
Type listType = new TypeToken>(){}.getType();
Gson gson = new Gson();
LinkedList users = gson.fromJson(jsonData, listType);
for (Iterator iterator = users.iterator(); iterator.hasNext();) {
User user = (User) iterator.next();
System.out.println(user.getUsername());
System.out.println(user.getUserId());
}
3\u3001\u5982\u679c\u8981\u5904\u7406\u7684JSON\u5b57\u7b26\u4e32\u53ea\u5305\u542b\u4e00\u4e2aJSON\u5bf9\u8c61\uff0c\u5219\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528fromJson\u83b7\u53d6\u4e00\u4e2aUser\u5bf9\u8c61\uff1a
\u4ee3\u7801\u5982\u4e0b\uff1a
String jsonData = "{\"username\":\"arthinking\",\"userId\":001}";
Gson gson = new Gson();
User user = gson.fromJson(jsonData, User.class);
System.out.println(user.getUsername());
System.out.println(user.getUserId());
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